<?php

/**
 * Thrive Themes - https://thrivethemes.com
 *
 * @package thrive-dashboard
 */
if ( ! defined( 'ABSPATH' ) ) {
	exit; // Silence is golden!
}

/**
 * Created by PhpStorm.
 * User: radu
 * Date: 03.04.2015
 * Time: 16:59
 */
class Thrive_Dash_Api_AWeber_Collection extends Thrive_Dash_Api_AWeber_Response implements ArrayAccess, Iterator, Countable {

	protected $pageSize = 100;
	protected $pageStart = 0;

	protected function _updatePageSize() {

		# grab the url, or prev and next url and pull ws.size from it
		$url = $this->url;
		if ( array_key_exists( 'next_collection_link', $this->data ) ) {
			$url = $this->data['next_collection_link'];

		} elseif ( array_key_exists( 'prev_collection_link', $this->data ) ) {
			$url = $this->data['prev_collection_link'];
		}

		# scan querystring for ws_size
		$url_parts = parse_url( $url );

		# we have a query string
		if ( array_key_exists( 'query', $url_parts ) ) {
			parse_str( $url_parts['query'], $params );

			# we have a ws_size
			if ( array_key_exists( 'ws_size', $params ) ) {

				# set pageSize
				$this->pageSize = $params['ws_size'];

				return;
			}
		}

		# we dont have one, just count the # of entries
		$this->pageSize = count( $this->data['entries'] );
	}

	public function __construct( $response, $url, $adapter ) {
		parent::__construct( $response, $url, $adapter );
		$this->_updatePageSize();
	}

	/**
	 * @var array Holds list of keys that are not publicly accessible
	 */
	protected $_privateData = array(
		'entries',
		'start',
		'next_collection_link',
	);

	/**
	 * getById
	 *
	 * Gets an entry object of this collection type with the given id
	 *
	 * @param mixed $id ID of the entry you are requesting
	 *
	 * @access public
	 * @return Thrive_Dash_Api_AWeber_Entry
	 */
	public function getById( $id ) {
		$data = $this->adapter->request( 'GET', "{$this->url}/{$id}" );
		$url  = "{$this->url}/{$id}";

		return new Thrive_Dash_Api_AWeber_Entry( $data, $url, $this->adapter );
	}

	/** getParentEntry
	 *
	 * Gets an entry's parent entry
	 * Returns NULL if no parent entry
	 */
	public function getParentEntry() {
		$url_parts = explode( '/', $this->url );
		$size      = count( $url_parts );

		# Remove collection id and slash from end of url
		$url = substr( $this->url, 0, - strlen( $url_parts[ $size - 1 ] ) - 1 );

		try {
			$data = $this->adapter->request( 'GET', $url );

			return new Thrive_Dash_Api_AWeber_Entry( $data, $url, $this->adapter );
		} catch ( Exception $e ) {
			return null;
		}
	}

	/**
	 * _type
	 *
	 * Interpret what type of resources are held in this collection by
	 * analyzing the URL
	 *
	 * @access protected
	 * @return mixed
	 */
	protected function _type() {
		$urlParts = explode( '/', $this->url );
		$type     = array_pop( $urlParts );

		return $type;
	}

	/**
	 * create
	 *
	 * Invoke the API method to CREATE a new entry resource.
	 *
	 * Note: Not all entry resources are eligible to be created, please
	 *       refer to the AWeber API Reference Documentation at
	 *       https://labs.aweber.com/docs/reference/1.0 for more
	 *       details on which entry resources may be created and what
	 *       attributes are required for creating resources.
	 *
	 * @access public
	 *
	 * @param params mixed  associtative array of key/value pairs.
	 *
	 * @return Thrive_Dash_Api_AWeber_Entry(Resource) The new resource created
	 */
	public function create( $kv_pairs ) {
		# Create Resource
		$params = array_merge( array( 'ws.op' => 'create' ), $kv_pairs );
		$data   = $this->adapter->request( 'POST', $this->url, $params, array( 'return' => 'headers' ) );

		# Return new Resource
		$url           = isset( $data['Location'] ) ? $data['Location'] : $data['location'];
		$resource_data = $this->adapter->request( 'GET', $url );

		return new Thrive_Dash_Api_AWeber_Entry( $resource_data, $url, $this->adapter );
	}

	/**
	 * find
	 *
	 * Invoke the API 'find' operation on a collection to return a subset
	 * of that collection.  Not all collections support the 'find' operation.
	 * refer to https://labs.aweber.com/docs/reference/1.0 for more information.
	 *
	 * @param mixed $search_data Associative array of key/value pairs used as search filters
	 *                             * refer to https://labs.aweber.com/docs/reference/1.0 for a
	 *                               complete list of valid search filters.
	 *                             * filtering on attributes that require additional permissions to
	 *                               display requires an app authorized with those additional permissions.
	 *
	 * @access public
	 * @return Thrive_Dash_Api_AWeber_Collection
	 */
	public function find( $search_data ) {
		# invoke find operation
		$params = array_merge( $search_data, array( 'ws.op' => 'find' ) );
		$data   = $this->adapter->request( 'GET', $this->url, $params );

		# get total size
		$ts_params          = array_merge( $params, array( 'ws.show' => 'total_size' ) );
		$total_size         = $this->adapter->request( 'GET', $this->url, $ts_params, array( 'return' => 'integer' ) );
		$data['total_size'] = $total_size;

		# return collection
		return $this->readResponse( $data, $this->url );
	}

	/*
	 * ArrayAccess Functions
	 *
	 * Allows this object to be accessed via bracket notation (ie $obj[$x])
	 * http://php.net/manual/en/class.arrayaccess.php
	 */

	public function offsetSet( $offset, $value ) {
	}

	public function offsetUnset( $offset ) {
	}

	public function offsetExists( $offset ) {

		if ( $offset >= 0 && $offset < $this->total_size ) {
			return true;
		}

		return false;
	}

	protected function _fetchCollectionData( $offset ) {

		# we dont have a next page, we're done
		if ( ! array_key_exists( 'next_collection_link', $this->data ) ) {
			return null;
		}

		# snag query string args from collection
		$parsed = parse_url( $this->data['next_collection_link'] );

		# parse the query string to get params
		$pairs = explode( '&', $parsed['query'] );
		foreach ( $pairs as $pair ) {
			list( $key, $val ) = explode( '=', $pair );
			$params[ $key ] = $val;
		}

		# calculate new args
		$limit              = $params['ws.size'];
		$pagination_offset  = intval( $offset / $limit ) * $limit;
		$params['ws.start'] = $pagination_offset;

		# fetch data, exclude query string
		$url_parts       = explode( '?', $this->url );
		$data            = $this->adapter->request( 'GET', $url_parts[0], $params );
		$this->pageStart = $params['ws.start'];
		$this->pageSize  = $params['ws.size'];

		$collection_data = array( 'entries', 'next_collection_link', 'prev_collection_link', 'ws.start' );

		foreach ( $collection_data as $item ) {
			if ( ! array_key_exists( $item, $this->data ) ) {
				continue;
			}
			if ( ! array_key_exists( $item, $data ) ) {
				continue;
			}
			$this->data[ $item ] = $data[ $item ];
		}
	}

	public function offsetGet( $offset ) {

		if ( ! $this->offsetExists( $offset ) ) {
			return null;
		}

		$limit             = $this->pageSize;
		$pagination_offset = intval( $offset / $limit ) * $limit;

		# load collection page if needed
		if ( $pagination_offset !== $this->pageStart ) {
			$this->_fetchCollectionData( $offset );
		}

		$entry = $this->data['entries'][ $offset - $pagination_offset ];

		# we have an entry, cast it to an Thrive_Dash_Api_AWeber_Entry and return it
		$entry_url = $this->adapter->app->removeBaseUri( $entry['self_link'] );

		return new Thrive_Dash_Api_AWeber_Entry( $entry, $entry_url, $this->adapter );
	}

	/*
	 * Iterator
	 */
	protected $_iterationKey = 0;

	public function current() {
		return $this->offsetGet( $this->_iterationKey );
	}

	public function key() {
		return $this->_iterationKey;
	}

	public function next() {
		$this->_iterationKey ++;
	}

	public function rewind() {
		$this->_iterationKey = 0;
	}

	public function valid() {
		return $this->offsetExists( $this->key() );
	}

	/*
	 * Countable interface methods
	 * Allows PHP's count() and sizeOf() functions to act on this object
	 * http://www.php.net/manual/en/class.countable.php
	 */

	public function count() {
		return $this->total_size;
	}
}
